电焊机2018，Vol.48Issue(3)：145-149,5.DOI:10.7512/j.issn.1001-2303.2018.03.26
静态拉伸载荷下焊接残余应力演变规律
Research on the variation rule of welding residual stress under static load tensile stress
摘要
Abstract
The local plastic deformation and redistribution of residual stress would occur under the superposition of static load stress and welding residual stress.The peak residual stress will decrease after the static stress unloaded.This paper was based on this theory and took A6005A-T6 aluminum alloys welded joints as the objectives to study the static loading conditions and gradual loading conditions under the evolution of residual stress.The results showed that the residual stress had relaxed in high degree after static load stress(the loading stress was 150 MPa),the peak value had changed from 125 MPa to 48 MPa of the longitudinal residual stress and the peak value had changed from 155 MPa to 56 MPa of the transverse residual stress.The reason was that the residual stress had relaxed due to the superimposion of external load and residual stress beyond the yield strength of the material had been plastic deformation.The welded structures could be statically stretched in some degree before using and could remove some residual stress especially the peak residual stress.关键词
静态工作应力/焊接残余应力/逐级加载/塑性变形/应力松弛Key words
static load stress/welding residual stress/loading step by step/plastic deformation/stress relaxation分类
矿业与冶金引用本文复制引用
孙海荣,王远霏,庞学苗,蒋洁..静态拉伸载荷下焊接残余应力演变规律[J].电焊机,2018,48(3):145-149,5.基金项目
中国铁路总公司科技研究开发计划(2016J011-C) （2016J011-C）
